Combined printing and sorting machine



June 1938., 4 F. L. FULLER :1" AL 2,122,136

COMBINED PRINTING ANI) SORTING MACHINE Original Filed Sept. 7, 1934 15 Sheets-Sheet 1 ALITORNEY June 28,1938.

F. L. FULLER ET AL 2,122,136

COMBINED PRINTING AND SORTING MACHINE Original Filed Sept. 7, 1934 15 Sheetj-Sheet 2 ATTO R N EY June 28, 1938. F. L. FULLER ET AL L EJ225136 COMBINED PRINTING AND SORTING MACHINE Original Fil ed Sept. 7, 1954 i5 Sheets-Sheet 3 A'TTORNEY June 28, 1938. F, 1. FULLER ET AL 2,122,136

COMBINED PRINTING AND SORTING MACHINE Original Filed Sept. 7, 19 15 Sheets-Sheet 4 ATTORNEY June 938- F. L. FULLER AL 2,122,136

COMBINED PRINTING AND SORTINGVMACHINE Original Filed se tfv, 1934 15 Sheets-Sheet 5 A'ITTORNEY June 28, 1938. F. L. FULLER ET AL COMBINED PRINTING AND SORTING MACHINE Original Filed Sept. 7, 1934 15 Sheets-Sheet 6 A'TTORNEY June 19318 F. FULLER ETAL 2,122,136

COMBINED PRINTING AND SOR'I'ING MACHINE Original Filed Sept. 7, 1 15 Sheets-Sheet 7 FIGJ4.

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5! :INXENjgBS BY ATTORNEY June 28, 1938. F. L. FULLER ET AL 2,122,136

COMBINED PRINTING AND SORTING MACHINE Original Filed Sept. 7. 1 l5 Sheets-Sheet 9 ATTORNEY June 28, 1938. F, FULLER ET AL- COMBINED PRINTING AND SORTING MACHINE Original Filed sept.

"7. 193 15 Sheet-Sheet 1o ATTORN EY June 1938. F. FULLER ET AL COMBINED PRINTING AND SORTING MACHINE 15 Sheets-Sheet 11 ATTORNEY June 28, 19318. F. FULLER ET AL 2,l22,fl3fi COMBINED PRINTING AND SORTING MACHINE Original Filed Sept. 7, 1934 15 sheets-sheet 12 ATTORNEY June 28, 1938. F, L. FULLER ET AL COMBINED PRINTING AND SOHTING MACHINE Original Filed Sept. 7, 1934 15 Sheets-Sheet l3 I VFN CR5 ATTORNEY June 28, 1938. F. 'L. FULLER ET' AL COMBINED PRINTING AND SORT-ING MACHINE Original Filed Sept. 7, 1 l5 Sheets-$heet 14 3- "wally-gas g ATTORNEY June 28, 1938.

5L. FULLER ET AL (COMBINED IPBELN'IZDNG AND SORTING MACHINE Original lF'iJlae d Sept. 7, .1934 15 Sheets-Sheet 15 !NETO$ 05m Aida.

ATTORNEY Patented June 28, 1938 Frederick L. Fuller, West Orange, N. I... and Samuel Brand, Binghamton, N. TL, asslgnors York to International Business Machines Corporation, New York, N. 11., a corporation of New Original application September 7, 1934, Serial No. 743,044. Divided and this application August 20, 1935, Serial-No. 36,948

35 Claims. (Cl. 101--2) This application is a division of the application of F. L. Fuller and S.. Brand, Serial No. 743,044, filed September '7, 1934, for Improvements in combined record sorting and accounting machines.

This application is restricted inits showing to a machine which is capable of sorting a group of promiscuously arranged checks, for example, in accordance with their classifications with further provisions of printing mechanisms for listing the amount of the checks in the sequence they are sorted and for listing the checks in classified groups. The listings according to classified groups gives lists of checks according to their ldsegregation in groups while the listing in the sequence the checks are sorted is provided for rapid checking purposes. A tape carrying the sequential listings can be compared amount for amount with the amounts listed on the depositors slips and any discrepancy can easily be observed.

A machine capable of effecting such functions has heretofore been constructed and designed and is illustrated in the patent to F. L. Fuller, No. 1,989,976, dated February 5, 1935. The .present machine includes several novel features which provide improved operations and greatly increase the efficiency of the prior arrangement.

The segregation of records has previously been attained in the patented machineby the use of a sorting drum which has always moved in the same direction to select a compartment and the selection of a compartment was effected without any reference to-the fact that the compartment -desired might have been directly adjacent the last compartment selected and in this case instead of effecting a short backward movement of the drum the latter was turned forwardly and given a long movement.

Such an arrangement greatly reduced the speed 40 of'the operation of the machine. The individual printers or the "compartment tape printers were ''carried by this drum and the combined weight of these together with the sorting compartments 'made the rotatable sorting drum very heavy.

While the selection of a suitable driving motor did not give any obstacles for a suitable means to rotate .the drum, it did require a complicated arrangement for stopping the drum at the desired compartment position.-

The main object of the present invention is to:

provide a series of compartment tape printers which are not located on the sorting drum and which may be selected under control of the keys which select the compartments. The selection of a compartment tape printer is preferably provided by a cam which rotates with the sorting drum and the contour of the cam is so designed that a different compartment tape printer is selected in each position of the drum irrespective of its direction of rotation.

A still further object of thepresent invention is to provide a plurality of sets of amount printing elements and means to cause their setting concurrently. While the plurality of sets of amount printing elements are set, the selection of one for printing is effected by the selecting means herebefore mentioned which functions'to select a desired platen for operation and a compartment tape feeding device.

Another object of the present invention is to provide for each printer a type segment and to cause all of the segments to be set to bring to printing position a type identifying the compartment selected. The selecting means also selects the desired segment for printing. e

A further object of-the present invention is to provide an improved compartment tape printer arrangement. In the present construction there are, provided twenty-four printers arranged in three groups 'of eight printers each. or each group there is provided a frame which carries the record strips, platens and record tape feeding devices. Each frame is detachable from the machine and when attached therewith the record tapes are associated with the related group of amount printing elements. The latter are car devices which effectively prevent further printing operations when any compartment isfilled to capacity and also to prevent further printing operations when the tape of any compartment tape printer is exhausted.

In the patented machine the compartment selecting keys were locked when a key was operated a limited number of times signifying the insertion of a certain numberof checks in the related compartment. However, it was still possible to operate the check feeding mechanism to insert a check in the filled-up compartment. The present arrangement effectively locks the machine release bar which causes the operation of check feeding mechanism and the selected printing mechanisms. The improved locking device is controlled by the checks already in the compartments instead of by a control from the keys.

mechanism and the ten-key controlling mecha means for automatically unlocking the machine when the printer frame having the exhausted roll of tape is re-attached to the machine after a full roll of tape has replaced the exhausted roll of tape. I

A still further object of the invention is to give a suitable visible signal to the operator when any compartment is filled to capacity and to give a distinctive visible signal when a roll of tape of the compartment tape printers is exhausted.

Other objects and advantages will appear from the following specification and drawings in which drawings:

Fig. 1 is a perspective view of the sorting machine provided with printing mechanisms) for listing all checks in the sequence they are sorted and for listing all checks in classified groups.

Fig. 2 is a view in right elevation of the machine with part of the enclosing cabinet. removed to show some of the interior.

Fig. 3 is a detail view of the locking bolt for the sorting drum.

Fig. 4 is an enlarged detail sectional view taken on the line 4-4 of Fig. 2, showing the brake for the sorting drum.

Fig. 5 is a top plan view of the driving mechanism of the machine.

Fig. 6 is a detail view of the full pocket switch.

Fig. 7 is av detail view of the full compartment signal and locking devices.

Fig. 8 is a sectional view taken on the lin 8-9 of Fig. 5.

, Fig. 9 illustrates the one revolution clutch for the driving shaft and its control by a machine release bar.

Fig. 10 shows the construction. of the check feeding roller frame. I

Fig. 11 is a sectional view taken vertically through the sorting drum.

Fig. 12 is a detail view of the mechanism provided tofeed checks in the selected pockets and shown in normal position.

Fig. 13 is a view similar to Fig. 12 but shows the .mechanism in operated position.

Fig. 14 is an electrical wiring diagram of the machine.

Fig. 15 is a top plan view of the item entering anism.

Fig. 16 is a detail view of the device for shifting the setup wheels when amounts are successively set thereon.

Fig. 17 is a detail view in side elevation of the item setup wheels. and the rack engaging mechanism for the item wheels.

-.Fig. 18 is a view in front elevation showing a part of the ten-key setup mechanism and the means for driving the master wheel for the setup wheels.

Fig. 19 is a sectional view of the ten-key mechanism and part of the electrical controlling mechanism.

Fig. 20 is another sectional view of the tenkey mechanism showing particularly the electrical coupling mechanism and electrical contact devices.

Fig. 21 is a detail view of the setup mechanism and the means for restoring the setup wheels to home or normal positions.

Fig. 22 is a. detail view of the means for operating the rack adjusting means.

Fig. 23 is a detail view of the operating mechanism for the individual compartment tape printers.

Fig. 24 is an enlarged detail view of one of on the base 38 (see also Fig. 5).

the compartment tape printers showing particularly the means for setting the type elements and for operating the printing hammer.

Fig. 25 is a. detail view of a part of the mechanism shown in Fig. 24.

Figs. 26 and 26a when taken together show a sectional view of the control tape printer and the compartment tape printers.

Fig. 27 is a detail view of part of the paper feeding device shown in Fig. 24.

Fig. 28 is an enlarged detail view of one of the compartment tape printers showing the hammer selecting and retracting mechanism.

Figs. 29 and 29a when taken together show the outside of the compartment tape printers and the control tape printer.

Fig. 30 is a perspective view of the compart- Framework (Figs. 2, 5, 8, and 11 The main framework of the machine includes three longitudinal frames 30, (it and 32 (Fig. 11) and mounted on a sub-base 33 (Fig. 2) which in' turn is supported on legs 34. The frames 30, 3| and 32 are joined by a back frame 35. The front legs 34 are Joined by a rod 36 and the back legs 34 are joined in a similar manner by a rod 31. These rods support a base or platform 38 (Figs. 2, 5, and 8) which is mounted on the drum controlling mechanism.

Drive mechanism (Figs. 2; 4, 5, 8, 9, 11)

Separate electric motors are provided to drive and the item printing mechanism.

The motor 40 (Fig. 5) also drives a generator 4| directly connected thereto for the purpose of supplying low voltage current to operate the several relays and other electrically operated devices with which the machine is provided and which will be described in detail later in the specification.

The motor 39 is reversible in order to drive the sorting drum from the position in which it was left at the last operation through the shorter distance to a selected position.

The sorting drum indicated generally at 5| (Fig. 1) is driven by the motor 39 through a gear 42 (Fig. 8) 'secured on the armature shaft 43. This gear drives a gear 44 fast on a shaft 45 suitably mounted in a gear housing 45 forming a part of the motor frame, and in a bracket 41.

The motor 39 and the bracket 41 are mounted A clutch disc 48 mounted to slide longitudinally on the shaft 45 but rotatable with shaft 45 through the medium of keys or splines 49, (Fig. 8) is adapted to be brought into contact with aclutch facing 50'mounted on a clutch disc 56 loosely mounted on the shaft 45. The clutch disc 56 i's-secured to a sprocket gear 51 also loosely mounted on the shaft 45, and, through a chain 58, (Fig. 2) drives a larger sprocket gear 59 secured to a drum shaft 50 mounted in suitable bearings supported 70 which was withdrawn at into physical contact. therewith by the energization of a clutch magnet 62 (Fig. 8). This magnet operates a pair of arms 63 fast on a shaft 64 ioumaled in a bracket 65. Also secured to the shaft 94 is a yoke 69 (Figs. 5 and 8) the 10 ends of which yoke carry rollers 97 projecting into an annular groove in the hub 98 of the clutch disc 48.

Obviously, when the magnet 62 (Fig. 8) is energized it attracts its armature 99 which is secured to the arms 63 rocking these arms, the

shaft 64 and the yoke 99 slightly clockwise (as viewed in Fig. 8), shifting the disc 48 into close contact with the facing 59 so that the rotation of shaft 45 is transmitted to the sprocket 51 to 29 frictionally drive the sorting drum.

As will be fully explained later in connection with the description-of the circuit diagram, the motor 39may operate in either direction under the control of the selector keys in order to rotate 25 the sorting drum the shorter distance to the selected position.

A brake mechanism is provided for the purpose of decreasing the speed of the drum as it nears the selected position. This brake mecha- 39 nism includes a brake drum I9 (Fig. 4) secured on the armature shaft 43 of the drive motor 39. A pair of brake shoes II and I2 pivoted on a common rod I3 and embracing the drum i9 are provided with suitable linings I4. The brake 35 shoes II and I2 normally press their linings against the drum I9 under the' influence of springs 15 compressed between retaining nuts 19 on the ends of a rod 11 and the upward ex,- tending ends. of said shoes II and 12. When at "the proper time, as will be described later, the

brake magnet I8 is energized it attracts its armature drawing a truncated cone 19 mounted on the lower end thereof, upwardly between rollers 99, there being a roller 89 mounted in the bifur- 45 cated upper end of each of the brake shoes II and I2, thus spreading the brake shoes and releasing the drum I9 for rotation. At approximately the time the selected pocket is at the desired position the magnet I8 is deenergized which 50 releases the brake shoes for action of their springs I9. This immediately brings the brake lining into eflective contact with the drum I9 to stop the rotation of. the sorting drum.

In addition to the application of the brake to '5 drum 19, other means is provided to-act as 'an effective brake for the purpose of stopping the drum. This means includes momentary reversal of the current through the-field windings of the motor 39. The manner in which this reversal is 0 accomplished will be fully brought out in connection with the description of the circuit diagram.

It may also be stated that following the momentary reversal of the current through the motor a resistance is automatically placed in the 65 motor circuit which has the effect of causing the engagement with one of a plurality of spaced alining notches 89 located about the periphery -76 of a ring 85 secured to the drum 5i.

. 92 (Fig. 2). secured to a main drive shaft 93 mounted in the frames 39,1 and 32. The drive shaft 93 rotates continually while the machine is in operation and drives a main cam shaft 94 by meansof a gear 95 (Fig. 9) fast on the drive shaft 93 meshing with a larger gear 96 rotatably mounted on the cam shaft 94. A one revolution clutch is provided and is rendered effective, under the control of a release bar 91, to couple the cam shaft 94 to the gear 99 whereby the shaft 94 receives one complete counterclockwise (Fig. 9) rotation at each check feeding operation. This clutch and release bar will be described later.

Keyboard (Figs. 1 and 14) A brief description will now be given of the various manipulative devices provided for controlling the machine. The sorting drum, indicated generally at 5| (Fig. 1), has twenty-four compartments into which checks may be sorted. In order to select the particular compartment into which the check is deposited and to control the rotation of the drum to bring the selected compartment into position to receive the check a plurality of selector keys 98- (Figs. 1 and 14) arranged in four banks of six keys eachis provided. These keys are slidably supported in plates 99 (Fig. 14) andl99 carried between suitable frames. Springs I92 compressed between the plate I99 and the shoulders on the key stems normally hold the keys 99 in the upward position.

The key caps carry suitable indications to designate the compartments according to the classification numbers, letters, etc., of the checks or vouchers to be sorted. For illustrative purposes. however, the keys 98 have been givennumbars from 1 to 24 to correspond with the .numbers of the compartments on the drum 5I.

Upon depression of. a key 98 a projection on the stem thereof cams a detent I93 toward .the right (Fig. 14) until the shoulder of said projection passes below the detent whereupon a spring I94 restores the detent to latch the key in depressed position. The detent I93 is in.the form of a large single fiat apertured plate and is supported between pairs of rods I95. The depressed key is held by the detent I93 until another key is depressed which shifts the detent releasing the previously depressed key. The keys 99 may not otherwise be released.

Each of the keys 98 carries at its lower end a rounded block of insulation which, upon depression of a key, is thrust between contact blades I96 to close two pair of contacts I91 and I98, there being a set of contacts I91 and I98 provided for each key 93. The-contacts I91 and I98 are connected by suitable-wires to the sorting dru n'control device which will be described later.

The sorting drum (Figs. 1, 2, 11 and 12) It was described above how theshaft 69 (Figs. 2 and 11) is mounted in theframe 33 and how this shaft is rotated by the motor 39 by means of the chain 58. The shaft 69 supports and rotates the sorting drum in the following described manas at I48, each of the parts I48 overlapping'its neighbor. The plates are then bent outwardly to form radial separators I49 for the compartments.

Near their outward extremity the plates are bent toward their respective rods I46, then, passing over these rods, said plates are bent slightly inward, these bent portions I50-I5I forming apertures through which the checks are fed into the compartments. Ears are bent outwardly from the separator plates I49, ,one near the ring I41 and one near the disc I40 and holes therein receive the .rods I46 to maintain the separators I49 properly spaced.

Near each end of the rods I46 are pivoted angular arms I52 which arms are Joined by sleeves I53 surrounding the rods. Between them each pair of arms I52 pivotally carries a check retainer or clamping plate I54 each pressed against the separator I49 at its left by springs I55 attached to the arms I52. Projections I56 on the lower edgesof the'plates I54 extend through slots in the bottom of the compartments to limit the movement of the inner edges'of said plates I54. The arms I52 are adapted to be swung counterclockwise (Fig. 12) to bring the outer edges of the plates I54 against the right hand separators I49 to permit ingress of the checks. The means for rocking the arms I52 will be described later.

Pins I51 project from the left handarms I52 (Figs. 1 and 11) to provide a convenient means for manually rocking the retaining plates I54 in order to remove the checks from the compartments.

Compartment selection (Fig. 14) Itwas previously stated that the selection of the check compartments in the sorting drum I is controlled by depression of the selector key 99 (Fig. 1) corresponding to the compartment it is desired to bring into position to receive the check. The control of the sorting drum is electrical and will be described in connection with the circuit diagram shown .in Fig. 14. Depression of a key 99 completes a circuit which causes the sorting drum to rotate and determines which direction said drum will rotate.

Referring now to the circuit diagram (Fig. 14) current to operate the sorting machine is supplied from lines I58 through a switch I59 which, when closed, energizes the motor 40. This motor runs continually driving the generator 4| and the drive shaft 93 (Fig. 2). Closing the switch I59 also provides current for the motor 39 by means of wires I60 and I6I but this motor does not start until a selector key 99 is depressed due to control relays now to be described. The current for operating the several relays is supplied by the direct current generator4 I the positive lead from said generator being indicated at I62 and. the negative lead at I63.

As was set forth previously there are twentyfour compartments in the sorting drum 5I and an equal number of selector keys 99 are provided to select the compartments. The blades of To form" the individual comparteach inner pair of blades I06 (Fig. 14) of the switches operated by these keys are connected by a common wire I64 (Fig. 14) to the positive side I62 of the generator 4I. Each of the left blades carrying one of the points of the contacts I01 is connected by a wire I65 to corresponding brushes I66. These brushes are stationary and are mounted in a suitable, insulating support I61 secured to the sub-base 33 by a. pair of brackets I68 (see Fig. 11). The brushes I66 are constantly in contact with a split commutator comprising separate segments I69 and I (Fig. 14) mounted in an insulating disc I16 (Fig. 11) secured to the sprocket 59 which, in turn, is fast on the compartment drum shaft 60. The segment I69 is electrically connected to-a ring I11 and the segment I10 is electrically connected to a ring I19 both of which rings are mounted in and rotate with the disc I16.

The commutator segments I69 and I10 have a fixed relationship with the compartment drum and rotate therewith, but rotate with respect to the brushes I66 consequently the spaces between the segments I69 and I10 may be between any adjacent pair of diametrically opposed brushes I 66. For the illustrative embodiment it may be noted (see Fig. 14) that one of the spaces separating these segments lies between the brushes corresponding to the No. 1 compartment and the No. 24 compartment, while the space separating the opposite ends of the segments lies between the brushes corresponding to the No. 12 and No. 13 compartments.

Depression of a key 99, for instance the 5 key, closes contacts I01 and completes-a circuit from the positive side. of the generator line I62 through line I64, contacts I01, the corresponding line I65, brush I66, commutator segment I69, the

common ring I11, a brush I19, a wire I80, contacts I9I,- through the coil of a relay I82, wire I83, contacts I64, wire I85 to the negative generatorlead I63. At the same time a circuit is completed through one coil I86 of two coil relay, contacts I81, wire I85 to line I6 energizing the relay I86 which attracts its armature I99 comprisingthe center blade of a three blade and I99 directly to the negative line side I63.

The circuit for the brake magnet 18 is completed through a wire I99, contacts 200, wires 206, 201, I91 and I96 to the negative side I63.

The operation of the brake magnet 18 (Figs. 4 and 14) draws its armature including the member 19 upwardly spreading the brake shoes II and I2 thus releasing the brake. Energization of the relay I95 closes contacts 208 (lower right of Fig. 14), closing a circuit from the negative lead I63, contacts 208, contacts 209 closed upon energization of relay I9I, to the negative side of motor control relays 2I0, 2II, 2I2 and 2I3. The energization of the clutch magnet 62 engages the clutch 49-50 (Fig. 8) between the sorting drum motor 39 and the sprocket drive 51-59-99.

The energization of the relay I82 (Fig. 14)

- 2I6completing a circuitfrom the positive generator lead I62, contacts I32, wire 2I1, contacts 2I8 normally closed, wire 2I9,jcontacts. 2I5 now closed by relay I82, wire 228, normally closed contacts 22I, wire 222, relay I82, wire I83, con-. tacts I84, wire I85 to the negative lead I63, thus setting up a holding circuit through the relay I82; Another circuit is completed through contacts I92, wires I93 and 2", contacts 2I4 closed by relay I82, wire 223, relay coil 224, contacts, 225, 226 and I84, wire I85 to line side I63. Energization of the relay 224 opens the contacts I8I thus opening the circuit fromthe commutator to the relay I82 to prevent any cross circuits when the commutator is in motion.

The closing of contacts 2I4 also completes a circuit through the magnet 81 which energizes this magnet to disengage the arm 86 (Fig. 2) from the notch 89 on the ring 85 thus freeing the drum 5i for rotation.

A circuit is completed at the same time through the contacts 2I5, a wire 221, normally closed contacts 228 to motor control relays 2H and 2I2, contacts 289 and 288 to the negative line I63. Energization of motor control relays 2H and 2I2 closes double sets of contacts 229 and 238 respectively completing a circuit through the motor 39 extending as follows: Positive side of the main supply line through line I68, normally closed contacts 238, contacts 238, armature of motor 39, contacts 229, wire I6I to the negative side of the main supply line I58 through switch The clutch is now efiective and the motor is running to rotate the selector drum to bring the selected compartments to position which, it will be remembered, is the 5 compartment for this particular example. The drum will continue to rotate, until it approaches within two compartments of the selected compartment as determined by the depressed selector key 98. A feeler or extended brush 231 (Fig. 14) carried on the end of an arm 238 and extending equal distances on each side thereof is in contact with a selected contact point 24I. The arm 238 is fast on the shaft 68 (see Fig. 11) and carries the feeler 231, also a shorter feeler 239. A brush 248 carried- ,by the arm 238 is adapted to successively wipe the contacts 24I mounted in an insulating disc 242 suitably secured to the base 33. There ,are 24 contacts 24I each electrically connected to the contact I88 associated with a corresponding selector key 98.

The arm 238 also carries a brush 243 in constant contact with a common ring 244 and electrically connected to the feeler 231 and 239 and to the brush 248.

When the "5 key was depressed the contacts H88 corresponding thereto were closed setting up a circuit from the,positive lead I62, wire I64, contacts I88, wire 245 to the 5 contact 24I. Now as the feelers 231 on the arm 238 which is rotating with the drum 5i, contact with the "9'?- contact 24I the circuit is extended through the feelers 231, brush 243, ring 244, wire 246, through tacts 288 to deenergize the brake magnet 18 which allows the springs 15 (Fig. 4) to apply the brake.

Energization of the magnet 258 also opens contacts236 throwing resistance 253 in series with the motor 39 thus reducing the speed of the motor.

At the time the feeler brush 231 compiet'ed the above described circuit, a circuit was also completed through the "5 contact point 24I, as set forth above, through wire 246, a pair of locking bolt magnets 254 (see also Fig. 3), wires 281,

I91 and I98 to the negative lead -I63.

At the time the feeler brush 231 wipes across the "5f contact however, the drum 5I is in a position between compartments and a bolt 255 (Fig. 3) which is adapted to be operated by magnet 254 strikes the inter-notch periphery of the ring 66 jecting from the bolt 256 is embraced by the bifurcated upper end of an arm 266 fast on a. shaft 261 to which is also fast the armature 268 ofthe magnets 254 and an arm 269 which operates the sets of contacts 288 and 249. The arm 256 has two opposed ears 218 bent outwardly therefrom in which ears are loosely mounted studs 21I between the inner'ends of which is compressed a strong spring 212.

In axial alinement with the outer ends of the studs 21" are two stop screws 212a. fast in supporting blocks 213 suitably secured, the upper one to machine sub-base 33 and the lower one on the bracket 258. The bolt 255 may entera notch 89 only when the drum has arrived at the selected position as will be described later.

When the relay 241 (Fig. 14) operated to close thecontacts 248 a circuit was extended from line I62, contacts I92, contacts 249, contacts 248, a relay coil 214, wire 215, contacts 216, wires 211, 281, I 91 and I98 to line I63. Energization of the relay 214 opens contacts 228 and 218 and closes contacts 219 and 288. Opening the contact 228 deenergizes motor control magnets 2H and 2I2 dropping contacts 229 and 238, at the same time closing of contacts 288 extends a circuit as follows: Positive lead I62, contacts I92,

wires W3 and 2", contacts 2I8, wire, 2I9, contacts 2I5 closed by energization of magnet I82, wire 221, contacts 288, through motor control magnets 2I8 and 213, contacts 283 and 288 to negative lead I83. The magnets 218 and 2 I3 now being energized, close their respective contacts 28I and 282 causing a momentary-reversal of the direction of flow of the electrical current through the motor 39 for the purpose of dynamic braking.

When the brake magnet 18 is deenergized and its armature drops, it closescontacts 283 (see also Figs. 2 and 4) setting up a circuit from line I62, contacts I92, wire i93, contacts 249, contacts 283, a relay coil 284, wires 281, I91 and I98 to line I63. Energization of relay 284 closes. contacts 285 setting up a holding circuit for itself'extending as follows: Line I62, contacts I92, wires I93 and 2", contacts 2I4, wires 286, contacts 285, coil 284, wires 281, I91 and I98 to line I63.

The energization of relay coil 284 also closesv contacts 281 again energizing the brake magnet 

